Answer:
The burden of proof was put on Mexican Americans to prove that they owned the land.
Step-by-step explanation:
What made it very difficult for Mexican Americans to win lawsuits against Anglo-Americans claiming their lands was the fact that the courts responsible for these lawsuits did not act impartially and always tried to ease the Anglo-American side. That's because the courts used legal evidence guidelines based on US law and that was very damaging to Mexican Americans.