Question

three or more ways in which current-day Ciudad de México and Ciudad de México of the past are the same and different.

Answer 1

(1) there's a program nowadays called "Hoy no circula" in Mexico city (meaning "You don't circulate today")

what this plan consists of is that they check the last digits of your license plates and if it ends with a certain number

let's say it's Monday and your license plate ends in 023, that number is in the list for no circulation on Monday and Thursday,if you get caught driving a car with license plates .If you get caught driving a car with license plates that are in the list of no circulation on the assigned day, you'd get a fine or even arrested (depending on the amount of offenses you've made)

(2) before, schools were limited to just books and spirals. Now, you've got to pay a certain amount of money (let's say 2,600 pesos , which would be around $210... which I remember paying for when I studied in Reynosa to get access to an electronic tablet and a typewriter)
to acquire materials such as typewriters which the school provides, electronics such as laptops and tablets... so on. You don't get to keep them, but you do have to pay them off.

(3) School's didn't have official ID's like USA high schools do. Some schools with high recourses do this.

(4)  Schools in Mexico didn't have sports to participate in when you were in elementary, now you've got stuff like basketball and soccer.

(5) The marching band (symphonic band that plays the trumpets and drums) was only a place for men but it has now been narrowed down to everyone in general (you've got to have a total grade of 9.3 and above to participate)

(6) There wasn't transportation in schools, except for peceras (which are like metro or buses, just smaller) and now your parents can get you transportation by paying around 150 pesos (around $10) a month.