Yanto

is it necessary to use the word "The" when you mention something like
"Let's welcome Allan from the US"
"Let's welcome Elena from the Philippines"
"Let's welcome Megan from the UK"

And why can't/don't we use "the" for other countries?
"Let's welcome Mandy from the China"
"Let's welcome Amy from the Norway"

Is it because of how the sentence sound?
I hope you know what I am trying to explain...

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