Bartolomé de las Casas's efforts to protect Indians had little impact because A. the royal government did not listen to him.
B. Indians were grateful to work for the Spanish.
C. new laws did not apply in Spanish colonies.
D. local officials ignored laws protecting Indians.

new laws did not apply in Spanish colonies

Explanation:

in february 1787, congress decided that a convention should be convened to revise the articles of confederation, the nation’s first constitution. in may, 55 delegates came to philadelphia, and the constitutional convention began. debates erupted over representation in congress, over slavery, and over the new executive branch. the debates continued through four hot and muggy months. but eventually the delegates reached compromises, and on september 17, they produced the u.s. constitution, replacing the articles with the governing document that has functioned effectively for more than 200 years.

c. the passage of the fifteenth amendment