Assertion: emirate | /r/CapableOf | unite to form the trucial states
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Source sentences:
text: In the 18th century, Portugal and the Netherlands extended their holdings in the region but retreated with the growth of British naval power there; following a series of truces with Britain in the 19th century, the emirates united to form the Trucial States (also called Trucial Oman or the Trucial Sheikhdoms).