They have one purpose and will give their power and authority to the beast.
OJBThese are united in yielding their ko'ach (power) and samchut (authority) to the Chayyah (Anti-Moshiach).
TCENTThese kings have one mind and will give their power and authority to the beast.
T4TThose rulers will all agree to do the same thing. As a result they will give to the beast their power to rule people as well as their authority to rule people [DOU].