Which of the following has been a key characteristic of federalism in the united states since the year 2000?
a. a general trend in supreme court decisions toward weaker federal control over the states
b. a broad reduction in federal power under republican presidential leadership
c. supreme court rejection of a greater role for federal power in regulation of health care
d. greater state initiative in the realm of immigration law and policy due to federal inaction

The correct answer here is option D.

Explanation:

Since the 2000s there has been an increase in interest in the realm of immigration law due to failure of the Federal government to come up with a concrete and widespread plan of combating illegal immigration. That's why there has been an increase in state initiatives that deal with illegal immigration and for example the local police forces are there to help combat illegal immigration.

it created the power of judicial review.