Do you have a source on how much plastic pollution is from the US? We do much less than our share from what I'm reading.
We do lead by example in this area. What exactly are you complaining about? In the US, unlike most major Asian and African countries, it has long been illegal to dump plastics in rivers and allow them to flow into the sea. Europe and the Americas together make up less than ten percent of total plastic pollution, and that figure seems to be decreasing.
In North America, less than 1% of plastic waste is mismanaged, meaning dumped into rivers, the ocean, or open landfills. The number for Europe (including parts of Asian Russia) is between three and four percent. For most of the resit of the world the figures are between 8-10%. East Asia, well over half of all plastic waste is improperly disposed of. If you want to talk about islands and mountains of plastic, East Asia is almost the entirety of the problem, with a bit of help from Egypt and central Africa.