Garth,
My sources tell me that the slave trade in Great Britain was outlawed in 1807; but slavery itself wasn't abolished there until 1833. There was quite the influx of slaves to Canada, Australia and the United States up to the mid-nineteenth century; some legal; many illegal.
I'm not sure where Newton fit into all of that.
I'm also not sure when he wrote the music for the Star Spangled Banner or the Canadian National Anthem; but it must have been during that time.
Jerry
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