Why does grundy think that acquiring canada will strengthen the american union?

The correct answer is that Felix Grundy thought to drive the British from the continent and in that way to lessen the anger of the Native Americans whose tomahawks they all feared. When the nation would lose the valuable trade with the Canadians, it would lose the stability in general, and they will eventually go by themselves.

detente translated to english means politics

one of the main reasons was definitely slavery. back in 1861, republican abraham lincoln was elected and ended up being a major influence in the slavery business. slavery greatly affected the texas economy because back in 1845 during the annexation of texas, slaves became a big part of the texas population. many texans that were in favor of the secession influenced groups through party ties.