During world war ii, which battle denied the japanese the opportunity to attack australia?
a)battle of the coral sea
b)battle of midway
c)battle of guadalcanal
d)battle of iwo jima

B) Battle of Midway, when the Japanese were defeated in the battle of Midway, they had to save their naval fleet from any future American attacks since they didn't have the money and the power to produce the carriers lost in the battle while the US had 7 carriers under construction (Japan had 1 under construction).

an effect of the steamboat's popularity was that people began building canals in the united states and europe. this was done to find another way to transport goods across the country and in that time, transportation using the river was very slow and dangerous. it depended entirely on manpower and the current of the river. that all changed in the late 1700's when steamboats were introduced. they soon revolutionized travel and trade through the river and dominated the waterways. eventually, other means of transportation took over from the steamboats, but there was a time that they the united states to expand to the west.