How can team leaders manage a team of different backgrounds or cultures?

Thanks 

He has to unite them in order to manage them successfully 

PICTURE THIS MERE EXAMPLE, AN EMPLOYEE CAN BE AN INDIAN INDIVIDUAL IN HR. NOW HIS HR DECISIONS WILL BE BASED ON HIS OWN PERSPECTIVE. HENCE, IT WILL FULFILL ANY INDIAN EMPLOYEE'S WORK NEEDS. 

NOW THAT YOU HAVE GOT THE PICTURE, IMAGINE HOW SMOOTH A COMPANY MAY MANEUVER WITH A DIVERSIFIED HR AND A MULTI NATIONAL STAFF WHERE EVERY EMPLOYEE WILL FEEL WELCOMED IN A WAY OR ANOTHER AS HE/SHE WILL SEE SOMETHING THAT REPRESENTS THEM.

YES, 

EACH AND EVERY COMPANY ACQUIRES DIVERSIFIED NATIONALITIES IN EACH DEPARTMENT.

THEREFORE TO START WITH BUILDING, WE NEED TO REFER TO TUCKMANSTHEORY REGARDING THE STAGES.

NOW EACH CULTURE HAS ITS OWN TRADITIONS, BUT ONE OF THE COMMON POINTS HUMANS HAVE IN GENERAL IS ACTUALLY EXTRACTED FROM THE NAME OF OUR CATEGORIZED KINGDOM (HUMANITY). NEVERTHELESS, AND ENGLISH OF COURSE.

SO IF WE COME TO VISUALIZE A DIVERSIFIED TEAM AND ITS POTENTIAL, THE ONLY ANSWER WOULD BE "THE SKY IS THE LIMIT'