What is the most common economic activity in mongolia? what are two problems facing the country?

The most common economic activity in Mongolia is herding livestock, such as raising cows, poultries, or sheep.
The two problems that facing the country is water shortage, which make it hard for them to maintain their main economic activities and their inability to compete with foreign trades.

It was a combination of conquests and alliances

Hello there mate : ) what’s the question exactly? i’d love to ; )