Which of the following best describes the system of slavery in the first few decades of the american colonies?
a)indentured servants became enslaved after four to seven years.
b)africans could not work as indentured servants; they were only enslaved.
c)enslaved people were enslaved for life, but their children were born free.
d)both africans and whites worked as indentured servants, not as slaves.

b)Africans could not work as indentured servants; they were only enslaved.

Explanation:

Slavery in the United States existed in the 18th and 19th centuries. Slavery had already been practiced in British North America since the early colonial times and was recognized by the Thirteen Colonies at the time of the Declaration of Independence of 1776. After the Revolutionary War abolitionist laws proliferated in the northern states, although the rapid expansion of the cotton industry since 1800 left the southern states strongly identified with slavery and tried to extend it to the new western territories. The United States polarized between the slave states and the free states, along the Mason-Dixon Line, which separated Maryland (slave) from Pennsylvania (free). This ideology difference would lead to the beginning of the war.

the confederate at bull run