Why must Latinos have everything in Spanish, and why won't they assimilate?

[SuperMillionaire]

And on a side note, I don't even think Latin America should be called Latin America. I think it should be called "Spanish America" or "Iberian America," if you want to include Brazil, because the majority of Latin America was conquered by Spain, with the exception of Brazil, which was conquered by Portugal, and Spain and Portugal together are referred to as the Iberian Peninsula.

Latin America represents colonies of Spain, Portugal and France. Notably, French Guiana is not even its own country - it is still a territory of France and therefore part of the European Union. French is the common language in this area.

But it's predominately Spain, though. Spain conquered the majority of the countries of Latin America.

The official language of this country is English, and if they want to come to this country, they should speak English. If they want to keep speaking Spanish, why don't they just go to Argentina instead? Argentina is a country of immigrants, similar to the United States, but the main difference is that Argentina's official language is Spanish, so why don't they just go to Argentina instead?

Because Argentina is a world leader like the US is?

That makes absolutely no sense. If Argentina is a world power, immigrants should be drawn to that country too. Why don't the Spanish-speaking immigrants of Latin America go to Argentina instead of the United States?