Is it too little too late?
In a sense, yes, but 'too little too late' implies that there were actions the US could have taken that would have constituted sufficient reparation, when that's actually not the case. When people have suffered psychological and physical torment, had their livelihoods and reputations destroyed, been separated from their families, when people have died... there
is no sufficient reparation. Throwing money at it or saying sorry does nothing except perhaps alleviate the weight of guilt on the conscience of the perpetrators. What needs to happen is that lessons need to be learned so that nothing similar happens in the future. The current demonisation of muslims and - thanks to Trump - those evil Mexicans, suggests that lessons have not been learned at all.
As an aside, you might be interested in reading about the life of
Frank Emi, who was one of the people incarcerated, and a key member of the
Heart Mountain Fair Play Committee, who fought the draft. That's right - those Japanese Americans who were imprisoned as potential traitors were in 1943 forced to take a loyalty questionnaire and then drafted into military service, and expected to fight and die for the country that had treated them as traitors and stripped away their rights! This makes the fact that Emi was forced to sell his family business at around 6c to the dollar at the time of internment seem relatively inconsequential...
Stop it. There is no demonization of Muslims nor of Mexicans. There was no Muslim travel ban. How can any thinking person think that it was a "Muslim" travel ban. The "banned" countries were: Iran, Iraq, Libya, Somalia, Sudan, Syria, and Yemen. Now let's see what are the most populous Muslim majority countries:
Indonesia
Pakistan
India
Bangladesh
Nigeria
Egypt
AND THEN Iran.
As anyone can see it wasn't a Muslim travel ban.
Re Mexico - you must be conflating LEGAL immigration with ILLEGAL immigration. The people of the United States, as with any country, can decide who does or who does not come in. The US accepts over 1,000,000 LEGAL immigrants per year. This is not the sign of an anti-immigrant or anti-Mexican population. This does not mean that ANYONE can enter at their discretion. This ought not be a difficult concept to grasp.