In order to draw the WIL into the International, the Americans exerted pressure on the three factions of the RSL to re-unite, after which the re-formed RSL could fuse with the larger WIL.
In order to draw the WIL into the International, the problem of the paper existence of the RSL had to be solved. The Americans exerted pressure on the three factions of the RSL to re-unite, after which the re-formed RSL could fuse with the much larger WIL.