Why were american soldiers nicknamed doughboys?

because the brass buttons on their uniforms looked like the flour dumplings or dough cakes called "doughboys", or because of the flour or pipe clay which the soldiers used to polish their white belts. 

Ifound this on google “the change in control meant as house minority leader, pelosi was widely expected to become speaker of the house in the next congress. on november 16, 2006, the democratic caucus unanimously chose pelosi as the democratic candidate for speaker.” i hope this

The answer would be limited.