What weakens the dollar?

Could you elaborate on the various factors that tend to weaken the US dollar? I'm particularly interested in understanding the economic and geopolitical dynamics at play. Does an increase in US debt or trade deficits impact the dollar's strength? What role do interest rate differentials and inflation expectations play? Are there any specific events or policies that have historically had a significant impact on the dollar's exchange rate? Additionally, how does global sentiment towards the US economy influence the dollar's strength or weakness?