AHC: USA with a Parliament

What POD could be used to have a fully independent USA with a parliament? The USA must not become independent in the same manner of Canada. They can stay British for longer, but must gain full independence before 1830.
 

samcster94

Banned
Have the original war fail. An alt-French Revolutionary war leads to some negotiated kind of peace(this is like OTL Republic of Ireland without partition). The British write up a constitution afterwards, where they are technically independent but the British control things like the navy and appoint people into this upper house. There is a second conflict in the 1820's, and this leads to independence, and a very different constitution is written(given slavery is on the wane and the brief period of semi-independence gave them a structure to build on).
 
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