I have long supported the following changes to the world.
1. Adopt and enforce English as the Universal Language for all interactions world wide.
2. Teach English in all schools world wide as the primary language.
3. All other non-English languages can be taught but only as additional culture classes with no educational impact or requirements, place them in the same area as Band, Theater and other electives.
4. World wide adoption of the standard Metric system, yes America that means you will need to change out all your signs, maps, packaging, regulation manuals etc.
4a. Imperial measurement classes can be taught but only as electives see 3.
5. World wide adoption of Driving on the right hand side of the road.
6. Standardize World Wide age limits for Driving, Voting, Alcohol, Tobacco, Marijuana, Firearms, Gambling and Adult entertainment. ( Honestly I could care less if its 16, 18, 21, or 25 ) as long as its the same everywhere.
While there are many many more things to rant about like bathrooms should all be made like those in Japan (No cracks in the Stalls) and We should all get to enjoy co-ed showers where you can ask that pretty person to scrub your back with out being made out to be a creep.
I think we if we could all adopt these 6 steps then a lot of the differences we have today would start to melt away.