Do you Know how I can create my own Union

[trafalgar23]

I would like to unite France and Belgium via a decision or events

I mean the only things that separate France and Belgium to united was British fear.

Can you give me some help How I can create my own Union?

[TheBromgrev]

Do you want to make a new nation, or do you just want France to annex Belgium and have Walloons and Flemings be added as accepted pops?

[trafalgar23]

Do you want to make a new nation, or do you just want France to annex Belgium and have Walloons and Flemings be added as accepted pops?

Both will be good

[TheBromgrev]

Having France annex Belgium and add both pops as accepted is by far the easier option. You can make your event or decision, then stick this code into the "option" or "effect" block, depending on which implementation you want.

inherit = BEL
add_accepted = flemish
add_accepted = wallonian
set_country_flag = union_with_belgium

and if you want France to gain cores in Belgium, add this to the end:

any_owned = { limit { is_core = BEL } add_core = FRA }

You can use an existing event or decision to see what the syntax looks like. In both cases you'll want to place in the appropriate trigger block:

not = { has_country_flag = union_with_belgium }

That flag will prevent the decision or event from firing multiple times.