radical government, the Catholic and conservative cantons, including Obwalden, formed the Sonderbund or separate alliance in 1843. When the radicals attempted to dissolve this separate alliance in 1847, they started the Sonderbund War. Though Obwalden participated in the War, the Sonderbund council surrendered before the Federal army reached the Canton. After the Sonderbund War, the old government was replaced with a liberal government. In response to the wide-ranging powers that Landammann Spichtig had held, the new government eliminated some levels of government and replaced lifetime appointments to Landammann with term limits. Spichtig was seen as having pulled Obwalden into the Sonderbund, and he was driven out of office and politics. Modern Obwalden In 1850, the Catholic Church was recognized as the only cantonal religion. However, in 1867 the cantonal constitution was completely rewritten. It changed the organization of the government and allowed the Reformed churches some rights, including the right to run their own schools. The 1867 constitution also weakened many of the special privileges that the Landmann held. In 1902 the constitution was rewritten again and it allowed citizens to demand a referendum on any law. In the following years a number of initiatives and referendums were submitted, some of which succeeded. In 1909, an initiative was approved which allowed 1,200 citizens to demand a secret vote on constitutional revisions. In 1922, the power of the Landsgemeinde was weakened further with the introduction of secret ballots on constitutional, legal and tax laws. The last complete revision of the cantonal constitution was in 1968. This revision addressed a number of small issues and clarified a number of laws, but there were no major changes. In 1972, women were first allowed to vote in cantonal elections and in 1983 the voting age dropped to eighteen. The Landsgemeinde was finally abolished in 1998. Geography Highest elevation: Titlis (Urner Alps), 3238 m Lakes in the canton include: parts of Lake Lucerne (Vierwaldstättersee), Lake Sarnen (Sarnersee), Lake Lungern (Lungerersee), Wichelsee, Tannensee and Melchsee. The total area of the canton is . , or about 40.2% of the canton is wooded. , or about 37.9% is used in agriculture. Of the rest of the area, or 3.2% is developed (structures and roads) and or 18.7% is classed as unproductive (rivers, mountains or glaciers). Politics Within the Swiss Confederation Obwalden is a half canton. This gives Obwalden all the rights and duties of full cantons, with