Here's a short story:

The fiber is most often spun into yarn or thread and used to make a soft, breathable textile. The use of cotton for fabric is known to date to prehistoric times; fragments of cotton fabric dated from 5000 BC have been excavated in Mexico and the Indus Valley Civilization in Ancient India (modern-day Pakistan and some parts of India). Although cultivated since antiquity, it was the invention of the cotton gin that lowered the cost of production that led to its widespread use, and it is the most widely used natural fiber cloth in clothing today. 

The earliest evidence of cotton use in South Asia has been found at the site of Mehrgarh, Pakistan, where cotton threads have been found preserved in copper beads; these finds have been dated to Neolithic (between 6000 and 5000 BCE). Cotton cultivation in the region is dated to the Indus Valley Civilization, which covered parts of modern eastern Pakistan and northwestern India between 3300 and 1300 BCE The Indus cotton industry was well-developed and some methods used in cotton spinning and fabrication continued to be used until the industrialization of India. Between 2000 and 1000 BC cotton became widespread across much of India. For example, it has been found at the site of Hallus in Karnataka dating from around 1000 BC. (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: Where was cotton used earliest?
Guess: since prehistoric times

Question: What is the fiber usually spun into?
Guess: into yarn or thread

Question: And what is it used to make?
Guess: a soft, breathable textile

Question: Fabric discovered in Mexico was dated from when?
Guess: from 5000 BC

Question: What is Ancient India now called?
Guess: modern-day Pakistan and some parts of India

Question: Was there an invention that lowered production costs?
Guess: yes

Question: What was it?
Guess: the cotton gin

Question: What is the most commonly used material in clothing today?
Guess: cotton

Question: Where was the earliest evidence of cotton being in use found?
Guess: South Asia

Question: At what particular site?
Guess: at the site of Mehrgarh, Pakistan

Question: What have threads been found preserved in?
Guess: copper beads

Question: To what period have they been dated?
Guess: to Neolithic

Question: What is the range of years in that period?
Guess: between 6000 and 5000 BCE

Now answer the following question in the same format.

Question: When did cotton become common across India?

Between 2000 and 1000 BC