In what ways does the federal government step on the rights of the states? why?

This is a polemical issue, because in many cases federal government step on the rights of the states. Usually, federal power is used to decide about a national matter, that could be only decide by the highest powers in the Nation, which is utilised in a Federal level and its highest jurisdiction around all Nation.

Several topics demonstrate this like gay marriage, marihuana consumption, guns laws, and so on...

About gay marriage, some states, internally, don't approve it, but now it's a federal right that two people with same gender can marry. On the other hand, we have guns policies. Buying guns is allowed in all states, however, Federal government (not state government), regulates the types of guns that can be purchase by specific people.

the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.