The Rocky mountains provided the greatest obstacle to railroad expansion
Martin Luther wrote the 95 Thesis and posted it on the church's door. <span />
There were a few causes that led to the American declaration of war against the British in 1812. At this time Britain was at war with France and attempted to cut off trade between the US and France. Additionally at sea the British were impressing US seamen or forcing them to become part of the British Royal Navy. Another cause of the war was that the British were helping to arm Native Americans to prevent American expansion westward. As a result of these forces the U.S. eventually went to war with Great Britain.
The US government had imposed tariff policies that set a higher price on imported (foreign) manufactured goods. Because the South was an agricultural economy, it either had to ship down form the North or import from other countries most of the finished goods it consumed. Either option increased the cost of goods for Southerners over the prices paid by Northerners. Because the North was a largely industrial economy, and because raw materials imported for manufacturing were not subject to tariffs, the North faced no such burden. Additionally, because there was no income tax at this time, federal gov't revenue depended largely on tariff revenue -- which meant it was paid disproportionately by the South. This revenue was spent on railroads in the North and in other ways that unfairly benefitted the North while largely ignoring infrastructure and development in the South. South Carolina threatened secession as far back as 1828 over the unfair burden of the protective tariffs.