An example of modern day amalgamation in the United States?

Answer: 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.