A key factor that pushed Mexicans to emigrate was not being able to support themselves at home, politics also affected them.
Answer:
concrete
The most notable building technique introduced by the Romans was the use of concrete.
Explanation:
After the revolutionary war, most states, especially those in the south, developed new slave codes. after the 1830s these laws became increasingly stringent, due to the tensions produced by the Nat Turner Rebellion in southampton county, VA., and the rise of the abolitionist movement in the north. hope this helps
