In 1819, two states joined the U. S. This meant that there were 12 states that allowed slavery and 12 states that did not. Which two were they?

Explanation:

Slavery in what would become the United States was established during European colonization. In 1776, slavery was legal throughout the Thirteen Colonies, after which colonies started to abolish the practice. Pennsylvania abolished slavery in 1780, and about half the states abolished slavery by the end of the Revolutionary War or in the first decades of the new country, although this did not always mean that existing slaves were freed. Although not one of the Thirteen Colonies, Vermont declared its independence from Britain in 1777 and at the same time limited slavery, before being admitted as a state in 1791.

explanation: we can only guess at how our actions may be perceived in the future. doing something really big like killing lots of people, saving lots of people, affecting the lives of lots of people is a sure fire way of being remembered in historical records. we can also make a difference in the history records by being a small influence on something bigger, whether that is as a civil servant, scientist or artist.

of course you could argue that we all affect history just as tiny cogs in a   bigger machine.

if you mean how do people influence our opinions of things which have already happened, then simply by writing a book which looks at things form a different perspective and trying to convince people that this perspective is more accurate or truthful. people do it all the time i.e. richard the third was a terrible or was he? plenty would disagree, it's just that their views aren't the most widely known.n: