Which group was most justified in its reaction to the treaty of versailles why?

It was Germany who reacted on the Treaty of Versailles. 
This was said to be the reason that pushed Germany to World War II. The Germans did not have proper representation for the treaty they were not allowed to participate in its formulation.  It made the treaty be an imposition rather than a negotiated agreement.   The Treaty of Versailles contained the complete demilitarization of Germany and the loss of their colonized countries. The Germans believed that this situation was not a fair treaty. 

“destroyers for bases agreement in the destroyers for bases agreement between the united states and the united kingdom on september 2, 1940, fifty caldwell , wickes, and clemson class us navy destroyers were transferred to the toyalbnavy from the united states navy in exchange for land rights on british possessions.” i hope this you .