I don't think Elon Musk actually does live in Texas. He lives in Los Angeles. I know he said he moved to Texas but I haven't found any sources that could verify that he actually has moved or where he supposedly moved to.
Elon moved to Texas for various reasons. 1: SpaceX's new vehicle, known as the Starship, probably for testing. 2: Tesla is building their Gigafactory in Austin. 3: There is no personal income tax in Texas.
Extra information after the quiz has a typo. "Bush's were not" should be "Bushes were not". This is according to the Chicago Manual of Style. Never use an apostrophe to make a word plural.
"Texas was an independent country" is debatable and should maybe be removed/changed to "de facto independent". At the time it didn't have much international recognition (only 3 countries in Europe) and I imagine if you read a Mexican history textbook it would say Texas was part of Mexico.
https://www.jetpunk.com/quizzes/presidents-by-state-quiz
Maybe you can in five years