Question

10th amendment
all rights and powers not granted to the national government by the constitution are
eserved\ to the states and to the american people
devised

Explanation:

The 10th Amendment of the US Constitution relates to the distribution of powers between the national government and the states/people. The concept of powers not granted to the national government being reserved to states/people is about the division of governmental authority, which falls under Politics (a subfield of Social Science) as it pertains to political systems, constitutional law, and governmental power structures.

Answer:

The subfield that best applies is Politics (under Social Science). The 10th Amendment deals with the distribution of governmental powers, a core topic in political science, specifically in the study of constitutional law and federalism.