Final answer:
Around 12,000 BP, important events occurred in Texas including the arrival of the first 300 families led by Stephen F. Austin and the outlawing of slavery by Mexican president Vicente Guerrero.
Step-by-step explanation:
Around 12,000 BP (before present), several important events took place in Texas. One significant event was the arrival of the first 300 families led by Stephen F. Austin, which marked the beginning of American settlement in Texas. Additionally, Mexican president Vicente Guerrero outlawed slavery in an attempt to weaken the influence of American settlers in the Mexican province of Texas. This decision had a major impact on the political and social landscape of the region.