Answer:
in June 1846, the Senate, preoccupied with war against Mexico, quickly approved the Oregon Treaty with Britain, setting the boundary at the 49th parallel.
The form of travel that greatly helped with the industrialization of north america was the steam engine or wagon.... (only two i remember being in the 1800's that were used a lot could even be the steam boat)
the American colonists were angered by the presence of British soldiers who had found deployment in America. This led to the Boston Massacre, which tightened the tension between the colonists and Britain even more
Members of the same country (the Confederacy wasn't recognized - it doesn't count as a separate country) were making absolute war on one another. It was brother fighting brother.
