Why where so many federal troops placed in western texans after the civil war

Federal troops began entering the state in late May 1865. Their commanders believed that their duty, at least in part, was to ensure loyal government and to protect the rights of the blacks who were free as a result of the war.

Explanation:

Im not sure if this is 100% right, but I'm pretty sure this was the reason. Hope this helps.

the right answer is the third one: turnpikes went short distances to connect markets. turnpikes, also known as toll roads, were very important for trade and transportation (of people, goods and products) in the 19th century, coinciding with the expansion towards the west. they contributed significantly to the economic development of the united states.