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Hi

mercedesgl2010 said:
If my nexus card application was declined by the US will that affect my future border crossing visits to the US

1. Depends on the reason it was refused.

PMM
 
I’m trying to be an immigration officer to refuse all Ukrainian people and Eastern Europe nations so no point to be in Canada

You are someone on a visitor visa who has applied H&C and was rejected. You've also applied for asylum here despite having no real grounds. You are far from becoming an immigration officer.