The United States of America has the largest-empire to date.

Please review facts:

"- Roman Empire at it's largest - 1,930,511 sq mi in area

- United States - 3,794,066 sq mi in area

Population:

- Roman Empire at it's most populous - 88,000,000 ppl

- United States 2008 census - 304,072,000

United States wins hands down."

-- http://answers.yahoo.com/question/index;_ylt=Amvo3...

However, there many reasons to believe the Roman Empire never fell:

Please also review the following research-results, which may (or may not) change your mind about the Roman Empire:

Roman Empire/World Government:

The Roman Empire was (and still is) the biggest empire on earth. The Roman Empire spread throughout the world. It is now commonly referred to as the "world-government". They still claim to accept Roman-Catholicism as their official religion.

That explains why so many government-buildings in Washington D.C. and London are made to resemble buildings in Rome.

Also note: Each of those nations refer to the Roman-Catholic church as the official church of the European Union & South American Union even though government-paid historians tell us to believe the Roman Empire was completely destroyed by random vikings, which supposedly came from the countries of Sweeden, Norway and Denmark.

If the Vikings were strong (and large) enough to defeat the whole Roman Empire, that would be the greatest defeat man has ever known. Even China & Japan couldn't bring down the Roman Empire. It's too vast & stronger than them.

That's one of the reasons why the Roman Empire has dissolved the sovereignty of so many nations, in such a short amount of time. They formed the European Union more than 30 years ago, and set up a world bank.

Note: The Nazis were used to conquer most of Europe, just like "Alexander the Great" was used to conquer most of the Eurasian countries (especially Syria). The Roan Empire/world government has been installing puppet-dictators to control populations for centuries.

We can't afford to believe those government-paid historians, who tend to mislead school-children (and adults) into believing that the Roman Empire fell, when it's clear that Roman Catholicism was a major part of that empire (and it's still a major part of it, today). The Roman Catholic church is the official church of the majority of the fiat-governments in Latin America and the rest of Europe.

Even the Nazis followed & observed Roman traditions to fulfill the wishes of the Roman Pope, throughout the 1930s & 1940s.

Notice how so-called sovereign-nations have adopted symbols of the "Holy Roman Empire"/Roman Catholicism:

 http://en.wikipedia.org/wiki/Coat_of_arms_of_Germa...

"The Romans built arches of triumph to celebrate the big victories won by the Roman Empire, while Hitler built them to celebrate victories he had not yet won."

Nazis count the Holy Roman Empire as the first Reich:

 http://www.germannotes.com/hist_ww2.shtml

 http://en.wikipedia.org/wiki/Flag_of_Germany

A lot of symbols of the Roman Empire are used on coins, which are manufactured in all of their world-banks (especially the Bank of England & Federal Reserve Bank)

 http://www.dmudd.net/hist697/msfinalhist.htm

Watch the Documentary called: "Money Masters"

http://video.google.com/videoplay?docid=-515319560...

It explains how the Romans have conquered not only the majority of the nations in the world, but they've also established central-banks in all of those countries, which they still dominate.

Since the Roman Empire is now a globalist-entity. It goes by many names, such as United Nations & Counsel of Foreign Relations. They have conquered all english-speaking countries (including Western European nations plus North & South American countries).

Their technology has always been more advanced than any other empires. The Mongolian Empire didn't even have a chance against the Roman, Greek, and Egyptian kingdom (which was later conquered by Rome).

After Rome conquered Israel, they've been rising & increasing their strength throughout the world.

Historians even admit that the Nazis followed the wishes of Roman Catholic Church (just another part of the Roman Empire).

Every country that keeps & observes the Gregorian-calendar (a.k.a. Julian-calendar) has been dominated by the Roman Empire.

The Roman Empire/World Government has control over the following unions:

South American Union

North American Union

European Union

All of them collaborate within the Roman Empire/World Government. So the empire of the Romans still exists, but it's become international/worldly organization, which shares "power" with communist dictators (excluding Hugo Chavez of Venezuela & Raul Castro of Venezuela).

The Vikings never defeated the Roman Empire. No one has done that, yet. School teachers tend to try to convince their students that Rome fell. It never fell. It tripped, and then it regrouped, and became globalist-government.

So far, the Romans have conquered the following nations:

 Great Britain (that explains why Queen Elizabeth still refers to herself as a Roman Catholic).

 Germany (that explains why it's part of the European Union, which considers Roman Catholicism as their official religion).

 Khazaria (that explains why a large part of that former-nation was renamed Romania).

 Egypt (that explains why Romans intermarried with the Egyptian/Babylonian Royal family, and now Africa has many Catholic Churches, which claim to be just "Christian", however they still have allegiance to the Nazi-German Pope in Rome).

 Israel (Romans have never lost control of Israel since the Nazi/Zionists used British Troops to establish military bases, there).