Actually my ancestors legally came to what is now the United States and also declared war on England. They fought to defeat the old system of government and install a new system of government. Now the descendents of those brave original American citizens are enjoying the fruits of the society that their hard fought victory helped create. Americans need not apologize to anybody for having created the greatest civilization and the greatest economy in the history of the world.
No, your ancestors wanted the same thing that these Mexicans want, except our ancestors didn't have people like you stopping them.
My ancestors came to the United States legally. As long as an immigrant comes here legally, I have no problem with that at all. If someone is in the United States illegally, then they need to be rounded up and deported expeditiously. If a Mexican national wants to come live in the United States, they need to fill out the necessary paperwork and wait for their turn just like everybody else around the world who wants to come here. Unfortunately, Mexicans have developed a very bad reputation for being a lawless people, a reputation that they have deservedly earned.