Immigration March- Unclear on The Concept

There was a big march here in LA. It was about some potential immigration reforms.

“LOS ANGELES Mar 26, 2006 (AP)— Immigration rights advocates more than 500,000 strong marched in downtown Los Angeles on Saturday, demanding that Congress abandon attempts to make illegal immigration a felony and to build more walls along the border.

The massive demonstration, by far the biggest of several around the nation in recent days, came as President Bush prodded Republican congressional leaders to give some illegal immigrants a chance to work legally in the U.S. under certain conditions.

Wearing white shirts to symbolize peace, marchers chanted “Mexico!” “USA!” and “Si se puede,” an old Mexican-American civil rights shout that means “Yes, we can.” They waved the flags of the U.S., Mexico and other countries, and some wore them as capes.”

I am a little confused about the purpose of the Mexican flags. Why would you wave them at a demonstration about immigration rights in the US. Something is a little off kilter there.