<Li> 1865--1918 </Li> <Li> 1918--1945 </Li> <Li> 1945--1964 </Li> <Ul> <Li> 1964--1980 </Li> <Li> 1980--1991 </Li> <Li> 1991--2008 </Li> </Ul>

What was happening in america in the early 1800s