As a result of the attacks on 9/11, the department of homeland security began issuing a color code system such as "orange" indicating a high threat pertaining to a) travel. b) fuel prices. c) building safety. d) computer hacking.

b. major john c. frémont led a rebellion called the bear flag revolt.

explanation:

during the bear flag revolt, from june to july 1846, a small group of american settlers in california rebelled against the mexican government and proclaimed california an independent republic. the republic was short-lived because soon after the bear flag was raised, the u.s. military began occupying california, which went on to join the union in 1850. the bear flag became the official state flag in 1911.

c) troops march forward in close formation against newer, more accurate weapons

i really do want to but i just don't know it i'm so sorry : (