Hi Oudemia
Had the same problem as you...top and bottom right were OK (ish) but bottom left was tough.
1D is a US state famous for its wilderness,containing 3 ignored wordplay letters.
18D is a biblical charcater with a name you'll need to have your teeth in to get right (there's TH and a PH in his name in that order), with (the first) 3 letters ignored in the wordplay.
And 34A is the US spelling of the name for a Roman magistrate, starting with P for President and a six letter word for reply, cut short.