UnScramble this Word: e i t n m a h a?

Questions

Richard Nixon published a book called __________?

Richard Nixon was the 1st U S president to visit China in february of what year?

River in the central U S, the largest & most important river in North America?

Roads on which trains of freight & passenger cars, drawn by locomotives, travel on tracks formed by pairs of parallel metal rails (locomotive)?

Robert Baden-Powell founded this group in 1907?