According to the textbook, one of the key reasons that immigration continues to be a controversial issue in the united states is because:
the perception that the diversity of the current generation of migrants raises cultural challenges

I need detailed information

Explanation:

If I can get this right, Immigration has always and will always be a controversial issue in the unites states, more so in the trump administration. There are plethora of reasons and some of which are due to the high influx of illegal immigrants as opposed to legal ones.

Another reasons may be as a result of the increase in crime rate especially in crime prone states such as West Baltimore, Los Angeles, Brooklyn et al. it is believed that reduction in the influx of immigrant will further reduce the crime rate in the country.

Just recently, president donald trump added some countries to the travel ban list, this implies that there will be strong scrutiny and background checks in those countries as such, there will be difficulty in visa approval.

Another reason is the rise of terrorist prone countries, just recentl a ukranian plane was clamp down by the iranians. Iran and its sisters are believed to harbour heads of terrorist  organization . Iimmigration checks and scrutiny are put in place to secure the life of the US citizens.

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