I don't think that there are reasons for a Monarchy. Democracy is delicate as we see in our recent political history. Monarchy would place our democratic values at risk; one devious Monarch, and it can be all over- democratic systems, separate powers of government bodies, can be manipulated and destroyed. Look at Hitler, his plan, his methods, his takeover, and his demise. Millions of lives lost while the world tried to figure it out. Putin's attack on Ukraine - lives and livelihoods demolished. Look at the current violations of our own constitutional right to separation of church and state - one sect imposing their beliefs on the whole country, persecution of Jews, Minorities, LGBTQ, etc. Anything other than Democracy would be disastrous for us.