"to affect with emotions" could be a meaing ''to move"
Answer: set the U.S.- Canada border
It was clearly stated in the Treaty of 1818 which also widen or expanded the United States that the U.S. - Canada border must be set at the 49th parallel. Treaty 1818 is also popularly known as "the convention respecting fisheries, boundary and the restoration of slaves". This marks a reset in the old borders and practices of the U.S.
Mahan's influence on strategy
Captain, later Rear-Admiral, Alfred Thayer Mahan (1840–1914) was an American naval officer and historian. Influenced by Jomini's principles of strategy, he argued that in the coming wars, control of the sea would grant the power to control the trade and resources needed to wage war.
