Final answer:
During the Second Industrial Revolution, Washington's industries saw a transformation with agriculture, timber, and commercial fishing becoming the state's most important industries. This shift was part of the broader transition in the United States from an agrarian economy to an industrial one, bolstered by advancements in transportation and communication.
Step-by-step explanation:
During the Second Industrial Revolution, Washington's industries transformed significantly. The era marked a substantial shift in the industrial landscape of the United States, which previously had an economy primarily based on agriculture. After the Civil War, with advancements such as the steamboat, telegraph, and sewing machine, significant industrial factories emerged in the northern states, while the southern states maintained a focus on agricultural production with slave labor.
In the context of Washington State specifically, the correct answer to how the state's industries changed during the Second Industrial Revolution is: Agriculture, timber, and commercial fishing became three of the state's most important industries (Option A). This period saw a growth in the production of goods for nationwide markets and less dependence on foreign imports. Washington capitalized on its natural resources, with its timber and fishing industries becoming integral parts of the state's economy alongside agriculture.
It is important to note that while textile manufacturing and tourism became important in some regions during the industrial expansion, in Washington, the primary growth was seen in the sectors mentioned above. The use of innovative technologies and the expansion of transportation, like railroads, facilitated the growth of these industries.