In the beginning earth was covered in ice like a giant snowball. The volcanoes punched there was through the ice to the surface. They released greenhouse gases that melted the ice and amino acids started to form. These amino acids combined to form DNA and primitive one cell creatures began to live.
Much later apes evolved into Neanderthals etc. At this time Countries and continents did not exist. The earth just had a giant land mass surrounded by seas. Due to tectonic plates this land mass broke up and the continents and countries were formed as plates collided with each other. This tectonic movement explains why creatures have evolved differently in different parts of the world. This is also true of the human race and the reason why Chinese look different to the English etc.