Free State
自由州
Do you know that there were slaves in the United States?
你知道美國曾經有奴隸嗎?
Before the mid 19th century, there were many slaves in the United States.
十九世紀中期之前,美國有很多奴隸。
When Abraham Lincoln became the president of the United States, he wanted to free all slaves.
亞伯納罕-林肯成為美國總統的時候,他想要解放所有奴隸。
The states in the midwest and northeastern parts of the United States supported his decision and free the slaves living in these places.
美國中西部和東北部各州擁護他的決定并解放了它們州內的奴隸。

These states were called the free states.
這些州被稱為自由州。
How many free states were there?
那時候有多少個自由州?
There were 19 free states at the beginning of the civil war.
內戰開始之前有19個自由州。
However, every state become a free state after the war.
然而,內戰結束后每個州都變成了自由州。