USA
Brazil has the second highest number of Christians in the world. France has the second highest percentage of Christians in the world. --source: Adherents.com
The country that has the most highways is the Netherlands. Belgium has the second highest number of highways in the world.
According to Bloomberg business week the country with the fastest internet speed is Hong Kong (with South Korea in second place and Japan in third. The U.K. and U.S.A do not even make their top ten).
I believe Georgia has the highest literacy rate and Cuba has the second highest. :D
RUSSIA
There is no highest number, highest prime number, or highest composite number. Therefore, there can't be a second-highest, third-highest, etc., of any of these types of numbers, either.
The United States has the highest GDP by far. It almost doubles the second highest, China.
India has the second highest number of starving people in the world, with a significant portion of its population facing food insecurity and malnutrition.
My country Singapore do not have a mountain but my second country have a mountain Called Doi Inthanon Ben Nevis is the highest mountain in the UK.
No.
No
No