Many Pro-Slave men came to the territory’s to vote people out of the territory’s weren’t allowed to vote so this was illegal. They also killed and fought abolitionists who wanted to vote against slavery so that made the north ( who were mainly against slavery) upset and the south happy.
The answer is letters and artifacts
The Protestant Reformation was the religious struggle during the 16th and 17th century which began as an effort to reform the Catholic Church and ended with the splintering of the Western Christendom into the Catholic and Protestant churches.
Hope this can Help! ;)
What Do U Mean By Why Did They Do This?