Final answer:
U.S. laws regarding race kept changing due to immigration.
Step-by-step explanation:
One reason that U.S. laws regarding race kept changing was immigration. The influx of immigrants from different parts of the world brought with them different cultural, racial, and ethnic backgrounds. As a result, the U.S. had to adapt its laws to address the changing demographics and ensure equal treatment for all individuals.
Learn more about U.S. laws regarding race and immigration