i think i may have overwhelmed whoever may have wanted to help with my last thread, so ill just go with one country at a time. so, right now, ill just be asking what i can do about the alternative history concerning the aztecs
keep in mind that im still new to this forum, so correct me if i step out of line on anything here
okay, the point of divergence is in 1521 right after the spanish defeat the aztecs and raze tenochtitlan. however, instead of being ultimately destroyed (as in not as many fatalities), they are merely subdued by the spanish and the european colonization of mexico goes ahead as normal. the aztecs stage a resistance movement and acquire horses and gunpowder weapons of their own. they manage fight that aztecs for a over three hundred years, during which they disrupt many spanish mining operations and steal precious metals from them, trading them to spain's enemies in exchange for modern weapons. consequently, the spanish dont grant indepdence to the mexican colonists, which also earns some sympathy for the aztecs among thee white mexicans after the american revolution and they start to grow in power.
then, in about 1846, the americans (having won previous wars and expanded far northward even into the arctic circle*) attempt to annex parts of spanish-america, notably texas, and the spaniards dont like this one bit, and the First Spanish-American War (analogous to the OTL Mexican-American War) begins. when the americans march into the mexican proper, they are approached by the aztec/mexican resistance and are joined by them on the condition that mexico be given back to the aztecs upon victory. the war pretty much goes as it did in actual history and ends in a joint american/aztec victory. spanish nobles in mexico are held ransom and are only returned to spain after the king of spain grants the aztecs the territory that they want and recognizes their independence. after this, the americans and the aztecs become close allies and trade partners and take on similar isolationist policies (except to each other)
theres alot of other history that concerns them in the post-1900 period, but the last major event in the pre-1900 period concerning teh aztecs, albeit to a lesser extent than it really seems, is their involvement in the Second Spanish-American War (analogous to the OTL Spanish-American War) where they convince the americans to join them in "liberating Mesoamerica from Spanish rule", which actually mostly succeeds and central america goes over to aztec rule
ive got their basic history down, but now i mainly just want to fill in the gaps between these and, if at all possibly, mock up some historical figures. any help, anyone?
LATE EDIT:

silly me, i forgot to add in teh * details on teh americans! elsewhere while the aztecs are still staging their resistance, other parts of history are still going on. the changes to OTL elsewhere that affect the aztecs the most are with the americans, who still achieve independence and win the wars that come their way, the most important change being that infantry fighting breaks out in 1812 against the british and, subsequently, large portions of canada become american territory, and a small part of northwestern mexico becomes american as a result of the war with spain (baja california, sonora, and chihuahua). these are mainly for aesthetics and so i can be more justified in calling them the United States of North America