So what you're saying is you don't believe that The American Dream DLC is working at all, regardless of the presence of CoP? Because your thread title seems to be saying it only doesn't work when CoP is present, that's all.
When you load the game with both those DLCs enabled, and go into the Contents menu, do they both show as 'active'?
TAD events are listed in the file ...\Steam\SteamApps\common\Europa Universalis IV\events\USADLC.txt . Yu can see in there what the conditions for them triggering are. For example the first one Congress of the Confederation:
Code:
trigger = {
has_dlc = "American Dream"
tag = USA
is_year = 1781
}
mean_time_to_happen = {
months = 100
}
Should on average happen within ~8 years of 1781 if you are the USA. Many of the others depend on that firing first. So are you confident you've met those conditions?