General Information
Copan is a Mayan Kingdom that is playable from 2 to 830. In 830, Copan mysteriously disappears from the map (and history); the primary reason why is still unknown to the day.
Possible explanation for the disappearance
According to Mayan historian and researchers (Mayanists) Simon Martin and Nikolai Grube, the city-state went into chaos after the country's greatest dynasty King was captured and executed by a former vassal in 738. After this event, it can be speculated that the administration and bureaucracy couldn't handle the disaster that was taking place, and that within another century, Copan ceased to exist.
See also: Maya, Xiu, Itza, Kiche, Calakmul, Palenque, Tikal, Cocomes
Strategy
First, focus on conquering the other Mayan states so you can form 
Maya, then you can focus on reforming the Mayan religion. Do whatever you can to pass reforms as quickly as you can. The advantage of the Mayans over the Central Americans is that the Mayan religion has no Doomsday; so that's one less problem for you. Just focus on crushing the Central American countries and Mayan vassals that try to revolt against you. The most important reform is the Colonist one, especially if you start at a date earlier than 1444. Having as much of the Americas colonized before the Europeans show up is your top priority after reforming the Mayan religion.
Decisions
Reunite the League of Mayapan
Requirements:
- Primary culture is in the Mayan culture group
- Religion is Mayan
- Is not:
Maya does not exist- Is not a subject nation
- Is not a colonial nation
- Is not a nomad nation
- At peace
- Owns core province: Petén (842), Sotuta (846), Chacuyal (2634), Ecab (2636), Mani (2637)
Upon Enactment:
- Country changes to Maya
- Set government rank to Empire
- Government changes to Despotic Monarchy
- Gain25 Prestige
- Gain a permanent claim to the Yucatan area
- Gain country modifier Increased Centralization for 20 years:
- -0.05 Monthly Autonomy Change
- +1 National Unrest
- -0.05
National Ideas and Traditions
Traditions:
- -10% Stability Cost Modifier
- -10% Advisor Costs
Ideas:
- Preserve Our Troops: +2.5% Discipline
- Tax Reform: +5% National Tax Modifier
- Regulated Contracts: -10% Mercenary Cost
- Contract Law: +5% Global Trade Power
- Peasant Levy: +5% National Manpower Modifier
- Mercantile Status: +5% Trade Steering
- Strengthening Land Tenure: +5% Production Efficiency
Ambitions:
- +10% National Tax Modifier