He's not done it on his own. His 'ambition' to be in power is driven by greed, and there are forces at work outside of Trump's immediate orbit who are driving pro Trump social media campaigns, spreading disinformation and supporting the suppression of the truth.
Trump is bought and paid for. China alone invested $Millions into Trump businesses whilst he was in office, and that was just the transactions that went through proper financial channels. I wouldn't like to even hazard a guess on how much money ended up in Trump's pockets and election campaign funds from Russian linked bank accounts.
It's not a 'total and complete takeover' just yet...