What helped the Mongol leaders maintain communication over long distances during the height of the Pax Mongolia

Horses and advanced transportation systems

Explanation:

There aren't specific choices for this question but I know that the Mongols used fast war horses to travel long distances and win wars. they also had an advanced road system.

lee and grant, both of whom held the highest rank in their respective armies, had known each other slightly during the mexican-american war (1846-48) and began their dialogue by exchanging awkward personal inquiries. characteristically, grant had arrived in his mud-splattered field uniform while lee had turned out in full dress attire, complete with sash and sword.

explanation:

"a shortage of traditional labor created new opportunities in the workplace. a major cause of the internment of japanese americans during world war ii was. racial prejudice. in the early 1940's, the "destroyers-for-military-bases deal" with great britain and the lend-lease act were evidence that the united states."