Final answer:
The aspects of U.S. immigration policy that have remained constant are disadvantages to non-white people and protection of human rights, as well as disadvantages to non-white people and advantages to white people. Thus, option a and c are correct answers.
Step-by-step explanation:
The aspects of U.S. immigration policy that have remained constant include:
a) Consequences disadvantageous to non-white people and protection of human rights:
Throughout history, certain immigration policies and laws have disproportionately targeted non-white individuals and discriminated against them. However, the U.S. also has measures in place to protect human rights and ensure fair treatment.
c) Disadvantages to non-white people and advantages to white people:
While immigration policies have varied over time, there have instances where non-white immigrants faced disadvantages while white immigrants were privileged. This inequality in treatment has been a consistent aspect of U.S. immigration policy.
According to the options provided, the correct answer is a) Consequences disadvantageous to non-white people and protection of human rights and c) Disadvantages to non-white people and advantages to white people.