Where did the term leathernecks come from in the book Code Talkers.

a.) it provides a clue to solve the mystery.

in my opinion, ap calculus was the most difficult. i often struggled with it a lot. however, i have gotten a lot better.

industrialization in great britain began with the global 'industrial revolution', a pioneer. industrialization in russia was the last in europe, a laggard.

great britain’s industrialization was driven by individual citizens, while russia’s was guided by the government.

very interesting story but where is the question what is actually a question i don't understand