They were bright red instead of camouflage greens and greys. In the American revolution for example, they stood out in bulk. We knew where they were in the woods or in public just because of their very bright red uniforms.
Firstly, the declaration of indepence had resulted from numerous conflicts between the American colonies and England when the colonies attempted to gain their independence from England's monocrial government system. Events that lead to the enactment of this document include the Boston massacre, the stamp act, the act of British soliders being able to raise taxes on colonies, trying to regulate their international trade policies and deciding who would regulate their colonial governments. Because a majority of colonists envisioned a country that would allow them to make more decision in how their government functions, many had rebelled forming groups such as the sons and daughter of liberty and participated in rebellions such as the Boston Tea party. These rising tensions between the two areas thereby caused the revolutionary war (which Americans had won with the assistance of France). Which eventually lead to the declaration of indepence which was the official document that had of course proclaimed that us colonies were free from England and where therefore an independent nation.
The government was persecuting them and Governor Bogg was issuing an exterminating order against them. The state of Illinois also asked them to leave. They also wanted to escape the non Mormons who were called Gentiles
Was the need to escape civil war, poverty, and the promise of migrant work on farms.