The two primary incentives sailors were offered for joining the navy were relatively high and stable pay, and pension plans if they stayed in long enough. These were especially appealing during times of economic depression.
Europe had fallen into a state of constant warfare
It was Called the frontier because some or most of the areas in America that where settled by ranchers hadn't been explored or discovered yet.
The contributions of African Americans for the Union war effort in the Civil War pushed the federal government, controlled largely by the republican party, to exchange the course of action and affected the consequences which included but were not limited to the amendment of the constitution to give certain rights to african americans.
I really hope this helps you a ton!