Final answer:
Anglo-Americans supported the Texas revolution due to a confluence of factors such as economic opportunities, expansion of slavery, and the ideology of American exceptionalism. Fueled by a profound cultural and legislative divide, and the attractive terms for land acquisition, these settlers aided the revolution, aiming to bring their culture and laws - including slavery - into the territory rather than adopting a Mexican identity.
Step-by-step explanation:
Anglo-American Aid in Mexican Independence
Anglo-Americans aided Mexican forces during the Texas revolution primarily because of aligned interests in the region. After the fall of the Alamo, the desire to avenge their Texan compatriots was strong among Americans, and Texas committees notably in New York and New Orleans, marshaled volunteers to the cause. These volunteers were enticed by available land and the potential to expand slavery and the cotton kingdom. This period saw a significant cultural and national identity divide between Anglo-Americans and Tejanos, exacerbated by differences in views on slavery, which was abolished in Mexican territories.
Stephen Austin, following his father's wishes, established a significant American footprint in Mexican territory. This, along with Mexico's colonization laws, encouraged a large influx of Americans into Texas. The climate and economic prospects, as well as the possibility to purchase land on generous terms, played vital roles in attracting settlers.
However, despite living in Mexican territory, many settlers did not adopt a Mexican identity due to profound differences in laws, culture, and especially, attitudes towards slavery - with Texas settlers largely hailing from slave states and thus keen on extending slavery into new territories.
This dynamic between the Anglo settlers and the Mexican government became untenable, leading to the Texas revolution and eventual independence. The Americans' motivations were thus a mix of economic opportunity, territorial expansion, and ideology, primarily revolving around American exceptionalism, an idea that it was their 'God-given right' to populate and civilize new territories - ideologies that clashed with Mexican laws, such as the abolition of slavery. The stark contrast in identities and interests ultimately culminated in American support for the Texas Revolution, rather than a union with the Mexican identity or governance.