An example of modern day amalgamation in the united states?

racial diversity and mix in US; foreign immigrants migrating to US(ie Muslim, Vietnamese, Chinese, etc...)

Explanation: Modern day amalgamation in the US means the process/action/result of combining or uniting. This can be simplified to mean a mixture of something in the US- and in the US, there is a mixture of different race and cultures, mostly because of the number of foreign immigrants migrating here due to personal reasons.

the answer is b, encourage free trade