English example sentences with "expansionism"

Vietnam is getting seriously frightened by the expansionism of China.
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I think that because the world demographics foretell a shifting to a much older population, it may help foster a global trend towards sustainability instead of expansionism. Such an outlook may affect phenomena like space colonization. If the population gets too old, would people still be motivated to colonize space?
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Are global population projections correct that assume a greater elderly proportion and an eventual dip? Will society shift its general philosophy from expansionism to sustainability?
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