CONCACAF qualifying pot - 35 teams (3/4 qualifying spots)
29 of those teams go through 3 'qualifying rounds' to for 6 spots in the group stages which is when the USA, Mexico, Costa Rica, Trinidad & Tobago, Honduras & Panama entered
Group stages wittled it down to 6 teams who then played for 3 automatic qualifying sports and 1 playoff places against the Asian playoff winners. Panama's group had Costa Rica, Haiti & Jamaica
UEFA Qualifying pot - 54 teams (13 qualifying spots)
No preliminary rounds
Potential opponents from the start include Germany, Spain, Italy, Netherlands, England, France, Portugal, Belgium etc
If yer gonna compare teams who have qualified for the tournament with Scotland, using anyone other than the UEFA based teams is pointless.
Croatia, Serbia, Iceland & Denmark spring to mind followed by Northern Ireland and Eire who made it to the playoffs