No matter the number of times you arrive in fully established societies like @MoghaluKingsley enthused on his arrival at Washington DC, coming from Nigeria, you will feel a gust of modernity thumping at your psyche.
It was also in 1790, same year, that Major Daniel Houghton started tracing the course of River Niger, but died in the Sahara desert; then Mungo Park continued, after which he discovered a river that wasnt missing.