Everything you said is factual. Colombia - great it was a drop in the bucket, they speak the same language and integrate, and it still is a big albatross on society there. US - mass European immigration meant that people needed to learn english to integrate, same religion caused easier integration, etc.
It's not nearly 1:1 with the current situations in the US and Europe, respectively.
I'm just saying that mass immigration has effects on the country, the people, the economy/housing, the way of life, etc.
People should fully understand this and then vote accordingly. It's something to openly discuss and digest, not something to be swept under the rug or "downvoted".