In the modern world, there is indisputably one dominant language, English, that is used for most international business. Your challenge is for another language to attain this dominant role, instead of English.
No fixed PoD. Try to be realistic.
Possibilities. Some are quite plausible, others are very unlikely.
1) French as a lingua franca
2) German as a lingua franca
3) Russian as a lingua franca
4) Spanish as a lingua franca
5) Portuguese as a lingua franca
6) Dutch as a lingua franca
7) Italian as a lingua franca
8) Greek as a lingua franca
9) Swedish as a lingua franca
10) Basque as a lingua franca
11) Latin as a lingua franca
12) Esperanto as a lingua franca
13) Arabic as a lingua franca
14) Japanese as a lingua franca
15) Mandarin as a lingua franca
16) Persian as a lingua franca
17) Hindi as a lingua franca
18) Swahili as a lingua franca
19) Turkish as a lingua franca
20) Indonesian as a lingua franca
21) Mongolian as a lingua franca
22) Cherokee as a lingua franca
23) Some other language as a lingua franca.
24) Multiple lingua francas
25) No lingua franca.
How would such a non-English world differ from ours?
No fixed PoD. Try to be realistic.
Possibilities. Some are quite plausible, others are very unlikely.
1) French as a lingua franca
2) German as a lingua franca
3) Russian as a lingua franca
4) Spanish as a lingua franca
5) Portuguese as a lingua franca
6) Dutch as a lingua franca
7) Italian as a lingua franca
8) Greek as a lingua franca
9) Swedish as a lingua franca
10) Basque as a lingua franca
11) Latin as a lingua franca
12) Esperanto as a lingua franca
13) Arabic as a lingua franca
14) Japanese as a lingua franca
15) Mandarin as a lingua franca
16) Persian as a lingua franca
17) Hindi as a lingua franca
18) Swahili as a lingua franca
19) Turkish as a lingua franca
20) Indonesian as a lingua franca
21) Mongolian as a lingua franca
22) Cherokee as a lingua franca
23) Some other language as a lingua franca.
24) Multiple lingua francas
25) No lingua franca.
How would such a non-English world differ from ours?