What event triggered mass migration to California in the mid 1800s? Why was this a problem?

i think it is the byzantine empire

first industrial revolution - the first wave of the industrial revolution lasted from the late 1700s to the mid-1800s. it industrialized the manufacture of textiles and began the move of production from homes to factories. steam power and the cotton gin played an important role in this period.

d)to gain support for the independence movement.

hope this : )