I thought it was easy traveling between USA and Canada. Maybe you should apply for a B2 visa and see what happens. Whatever happens, you should write about your experience here so people in similar situations can decide how to go about doing things the right way.

Entering US on a B1/B2 visa from London should not be a problem as long as your visa is valid. As for documentary evidence, you may need to prove at the port of entry that your stay is only temporary. If you have your return ticket that would help. You may be asked about the details of your stay in ...

Her family members will not be able to sponsor you. She can sponsor a K-1 Fiance visa for you and if you get it you should enter the US and get married within 90 days and apply to adjust your status. If you marry outside of the US she can sponsor a K-3 visa for you and you can enter the US and ...