The French concentrated in exploring Canada because they already had forts in it in Quebec and in other parts of Canada, also there wasn't too much fighting over Canada except for the British so they decided to explore Canada.
The correct answer to this open question is the following,
In 1829, President Andrew Jackson offered to buy Texas from Mexico for $5 million. The Mexican government responded to President Jackson's offer to buy Texas with a negative. Mexican rulers did not agree.
The reaction of the Mexican government was to prohibit more American emigration to Texas. United States people and some Texans did not want to learn and assimilate the Mexican culture, did not want to convert into Catholicism, and never considered learning Spanish, the official language in México.
Texans did not consider themselves Americans, either Mexicans; they were Texans and were eager to form their own Republic.
Some push factors were the chance to get rich, Dry farming, owning land, escaping the nightmares of the south ( slaves ). There were also longhorns to sell. Some pull factors were relatives and spouses not wanting them to go.
