What message is this poem giving us?

Cargoes (1902)

Quinquireme of Nineveh from distant Ophir
Rowing home to haven from sunny Palestine
With a cargo of ivory,
And apes and peacocks,
Sandalwood, cedarwood, and sweet white wine.

Stately Spanish galleon coming from the Isthmus,
Dipping through the Tropics by the palm-green shores,
With a cargo of diamonds,
Emeralds, amethysts,
Topazes, and cinnamon, and gold moidores.

Dirty British coaster with a salt-caked smoke stack
Butting through the channel in the mad March days,
With a cargo of Tyne coal,
Road-rail, pig-lead,
Firewood, iron-ware, and cheap tin trays.

John Masefield (1878-1967)

Thanks very much for your help.

I'm out of my league but I see quite a number of views with no posts. I'll take my best shot.

Looking in the Dictionary Ophir is a land of gold from the bible 1st Kings reference.
The cargo mentioned comes from or is of living things. also mentions a 'reme' a human powered vessel

The middle stanza is old but not as old..
The cargo is made up of things but beautiful things..

The last stanza. from 1902..a steam ship..dirty.in a hurry..with dirty things.

It's seems to me that the author is describing a decline in our values over time.