▁Fort y ▁Years ' ▁War ▁( 1 3 8 5 – 1 4 2 4 ) ▁with ▁Han th aw addy ▁left ▁A va ▁exha usted . ▁From ▁the ▁ 1 4 2 0 s ▁to ▁early ▁ 1 4 8 0 s , ▁A va ▁regularly ▁faced ▁re bell ions ▁in ▁its ▁v ass al ▁regions ▁whenever ▁a ▁new ▁king ▁came ▁to ▁power . ▁In ▁the ▁ 1 4 8 0 s ▁and ▁ 1 4 9 0 s , ▁the ▁P rome ▁Kingdom ▁in ▁the ▁south ▁and ▁the ▁Sh an ▁states ▁under ▁A va ▁s way ▁in ▁the ▁north ▁broke ▁away , ▁and ▁Ta ung oo ▁became ▁as ▁powerful ▁as ▁its ▁nom inal ▁over l ord ▁A va . ▁In ▁ 1 5 1 0 , ▁Ta ung oo ▁also ▁broke ▁away . ▁ ▁A va ▁was ▁under ▁intens ified ▁Sh an ▁ra ids ▁for ▁the ▁first ▁quarter ▁of ▁the ▁ 1 6 th ▁century . ▁In ▁ 1 5 2 7 , ▁the ▁Confeder ation ▁of ▁Sh an ▁States , ▁led ▁by ▁the ▁state ▁of ▁Moh ny in ▁in ▁al liance ▁with ▁P rome , ▁s ack ed ▁A va . ▁The ▁Confeder ation ▁placed ▁nom inal ▁k ings ▁on ▁the ▁A va ▁throne ▁and ▁ruled ▁much ▁of ▁Upper ▁Bur ma . ▁As ▁P rome ▁was ▁in ▁al liance ▁with ▁the ▁Confeder ation , ▁only ▁the ▁tiny ▁Ta ung oo ▁in ▁the ▁sout he astern ▁corner , ▁east ▁of ▁the ▁B ago ▁Y oma ▁mountain ▁range ▁remained ▁as ▁the ▁last