Who are the Allied Powers? What is their war plan? Why are they aligned politically? What are their goals in the war?
I am sorry what wars are asking about. The terms Allies was used in several wars including WWI, WWII, Both Iraq Wars, Napoleonic War etc. I am afraid you need to specific... Good luck!
The allies in WWI were:
1) United Kingdom
and later Italy against Austria and USA almost at end of the war
Their plan is to squeeze the Central Forces from the West (France, Belgium and UK) east Russia and Serbia
Yes especially UK, and France were politically aligned and to some extent Russia under the Tzar.