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The US presidential election has nothing to do with the Bitcoin blockchain congestion.The network got congested due to a large amount of transactions conducted in a short time frame.
Of course it's the people who makes these transactions that clogs the network. There is no proof that it does or it doesn't affect cryptocurrency trading and it could just be a coincidence that it happens the same year Bitcoin halves. It's not really our job to figure out.
The number of unconfirmed transactions on the mempool directly proportional to the market condition and bitcoin price.
What do you mean directly proportional? If bitcoin crashes then the unconfirmed transactions will be less too? I seriously doubt that. The likely scenario is most traders will be rushing to sell their BTC for stable coins or fiat while the smarter investors will be waiting in line to accumulate more then move them out of exchanges. The same activity.