From victory at Guadalcanal, the Allies were able to launch the Central Pacific drive and subsequent offensive operations against which the Japanese could only defend with fewer and fewer naval, aerial, and army assets. Guadalcanal, not Midway, probably turned the tide irreversibly for the Allies in the Pacific.
Gather or gathering maybe grouping
I got three for ya
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1.) The gold rush caused California's population to increase dramatically;
2.) it brought people from many different backgrounds to California; it made California more democratic because people were more equal in mining communities;
3.) it caused Native Americans and Californios to lose their land