Who are the foreigners that Teran repeatedly refers to?

After a small revolt Mexico became worried that America was trying to take Texas. The Mexican government sent General Manuel de Mier y Teran to investigate Texas. He observed that: the Anglo (white) American settlers outnumbered the Mexican settlers five to 1 (for every 5 Americans, there was only 1 Mexican).

Explanation:

2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.