Pioneers who crossed the Sierra Nevada mountains in the mid-1800s were threatened by exposure to too much sun.
Apache and Comanche attacks.
snow and freezing temperatures.
slow travel across sand.

Don’t mind the already marked answer but taking it now

Aclaim about history is most likely not valid if it has which of these characteristics?

Revolutionary war. date battle result april 19, 1775 june 17, 1775 dec. 31, 1775 aug. 27, 1776 oct. 26, 1776 dec. 26, 1776 sept. 11, 1777 sept. 19, 1777 oct. 4, 1777 oct. 7, 1777 dec. 5, 1777 june 8, 1778 sept. 16, 1779 march 29, 1780 sept. 28, 1781 can i get the name of the battles and the result on the battles on the dates above