Diversity, in the U.S. adds to the wealth of our nation in terms of tolerance in living together, a fund of ideas, enrichment of language, the arts and sciences. I'm sure I left out a bunch, but we've taken your huddled masses and we have benefited.
However diversity also has its problems with making decisions in the public best interest, in resolving social problems owing to the many views, and there is less cohesion that tie us together. Diversity does not protect minorities well.
In America, we love our country and flag but do not love each other. The war cry is often "not in our backyard". Immigration, Gay Rights, and formerly Civil Rights were and still are major struggles.
In Argentina, you can make a point that the Catholic Church is wrong and people and legislature may follow, but in the U.S. you have to sell all Churches, Synagogues, Mosques, Temples being wrong. It is easy for a Karl Rove type to poison many wells and make common social agreement that crosses party lines more difficult.
A byproduct of diversity is that money and power become the prime motivating engines so only the courts can provide equality and only in some jurisdictions.
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