The one reason that people immigrated to Texas during Reconstruction was because Texas had extended full legal rights to former slaves. The correct option among all the options that are given in the question is the first option. The government also set up schools and negotiated the price of labor in Texas.
B. Supporting religious toleration and D. treating Native Americans fairly.
Roger Williams was the the founder of the Providence Plantation (the colony of Rhode Island). He was a Protestant who advocated for religious freedom and for fair treatment of Native Americans. He started the first Baptist church in the New World.