I think it was because evry European country was trying to expand.
During the confederation days, there was no executive mechanism of negotiating with foreign powers. Each and every decision was being decided on a thirteen vote basis, and any state could veto the law. at the same time the confederations was facing border crisis between it and imperialistic powers from Spain to England. A few years later later, the Napoleonic wars emerged in Europe and USA neutrality was put into the test, culminating in the war of 1812.
Apache scouts..............
Economic productivity has declined in some countries as a result of : Bubonic Plaque
In the past, Bubonic plaque manage to kill about 25 - 30 % of the world population, these greatly decrease the number of workers that could contribute to production activity and reduce Overall economic productivity in several countries
Exclusive.
hope this helps :)