Final answer:
Texas becoming an American state is the last event among the given options.
Step-by-step explanation:
The event that happened last among the given options is Texas became an American state. To provide some context, let's look at the chronological order of these events:
- Mexico became independent from Spain.
- Texas became independent from Mexico.
- Mexico and the United States fought a war.
- Texas became an American state.
As you can see, Texas becoming an American state is the most recent event among the options provided.
Learn more about Order of Historical Events