Children should be able to write some letters by their fourth birthday? true or false

I believe that this is true. Often at the age of 4, children learn how to write their name and certain other words and letters

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain