Why quit our own to Stand upon Foreign ground? It is our true policy to steer clear of permanent Alliances with any portion of the foreign world.....'
-George Washington
Answer:
Napoleonic Wars in Europe had an impact on almost all the colonies in the Americas. These wars were a distraction for all the European powers. The Naval blockade of the Atlantic allowed the colonies to assert their independence and rebel.
Mexico gained independence in 1821. Louisiana's purchase was also resulted due to the Napoleonic wars when the British Navy made it impossible for Napoleon to control the new territories in the Americas, he sold Louisiana to the US.
The wars caused Portuguese leaders to leave Europe and rule the colony of Brazil from the colony itself. Due to Napoleonic wars, the Portuguese court fled from Brazil and it became a kingdom. It allowed them to trade with any country. When Brazil finally became independent of French occupation in 1815 it had become accustomed to the local leadership this was a major issue which leads to the Brazilian War of Independence
One item can be the weapons. Many Europeans gave the natives a bunch of weapons because they had plenty. They even gave them faulty weapons or broken ones because the natives didn't know any better.
