Question

4. Why was there a War of 1812?

Answer 1

have a look here for details....

http://en.wikipedia.org/wiki/War_of_1812

Answer 2

"The immediate causes of the War of 1812 were a series of economic sanctions taken by the British and French against the US as part of the Napoleonic Wars and American outrage at the British practice of impressment, especially after the Chesapeake incident of 1807"