That's a nonsensical question, since sunset and sunrise are relative terms, depending on your location on earth. Since the earth is constantly rotating around the sun, there is no objective "last country" where the sun sets - the sun just perpetually sets in the areas tangential to it.
The last country on earth where the sun sets is U.S. Minor Outlying Islands, specifically Johnston Atoll. This is because of its position in the Pacific Ocean and the International Date Line, making it one of the locations to experience the latest sunset on the planet.
The Sun appears to set because the Earth rotates, turning one side of the Earth away from the Sun for a period we call "night"
Assuming you mean "why": if the Sun appears to set, that is the result of Earth's rotation.
The rotation of the earth is what causes the sun to appear to set
no and no
last
norway
Rotation of the Earth, with the sun going out of view.
The sun set
sky
WEST
It depends where you are on Earth.
No, the sun does not technically set into the sea. The Earth revolves around the sun which makes the sun appear to set into the sea especially when you are watching a sunset at the beach.