It wouldn't do a damn thing.

Amazon makes a metric shit ton of money, from people all over the world. They make over twenty billion just in Amazon prime fees from America alone, annually.

That's money in their pocket before they've even sold a single product.

Even if every Trump supporter in this country boycotted Amazon for a year, it would hardly make a dent in the bottom line of an international super-corporation like Amazon.

You need to understand the scope of what you're advocating against.