Old news. Happened in the U.S. too and against lots of Europeans, including the Portuguese.
They were so associated with being dark skinned that the Melungeon communities in the south (a mix of British and Black), used to explain their appearance by saying they were of Portuguese descent. People in the Far East who were Eurasia used the same ploy. I guess they were the darkest Europeans they could think of.
Of course, Spanish immigrants mainly didn't come here; they went to Central and South America, so there is less information about them.
With Italians a good bit of it was linked to the fact that the immigrants to north eastern factories were associated with anarchists and socialists.
Perhaps the immigrants who faced the most discrimination in the U.S. were the Irish. A whole political party was formed to stop them from coming here.
https://www.history.com/news/when-america-despised-the-irish-the-19th-centurys-refugee-crisis
Really, Henrique, you're going to have to do better than this if you want to t-roll here. There's no substitute for solid historical knowledge.