Which 1600s explorer gave France it's claim to Texas?
Rene Robert Cavelier Sieur de La Salle
No officially recognised country today does claim metropolitan France. The British Royalty has had claims on the French throne and kingdom from 1337 up to 1815 and the heirs were crowned as both kings and queens of England and France. There are separatists movements that claim some parts of France, as well as conflicts over France's possessions abroad, but no country does claim France, and France does not claim "countries" either.
Many Thought it was Barthalomuel Diaz,But Columbus Was The First Person To claim Land For Spain,Also Portugal. Bartolomeu Diaz was a Portuguese explorer who sailed under the Portuguese flag, so there is no way he could have claimed any land for Spain. So indeed it is Columbus who was the first to claim land for Spain.
The Texas claim is based on being a break way Republic from Mexico whose claim is based on Spanish exploration and settlement. Since Texas had no exploration of the area in question the Texas claim to lands along the north and eastern banks of the Rio Grande lack merit and standing. But that was all settled effectively in the 1850 compromise. The US did uphold the Texas claim to El Paso and in the County…