▁James ▁Har b ord ▁defeat ▁Imperial ▁German ▁forces ▁under ▁Wilhelm , ▁German ▁Crown ▁Prince ▁in ▁the ▁Battle ▁of ▁Belle au ▁Wood . ▁ 1 9 2 4 ▁– ▁The ▁American ▁occupation ▁of ▁the ▁Domin ican ▁Republic ▁ends ▁after ▁eight ▁years . ▁ 1 9 2 7 ▁– ▁The ▁Cy clone ▁roll er ▁co aster ▁opens ▁on ▁C oney ▁Island . ▁ 1 9 3 4 ▁– ▁United ▁States ▁President ▁Franklin ▁D . ▁Ro ose vel t ▁signs ▁the ▁Federal ▁Cred it ▁Union ▁Act , ▁which ▁establish es ▁credit ▁un ions . ▁ 1 9 3 6 ▁– ▁Initial ▁flight ▁of ▁the ▁F ock e - W ulf ▁F w ▁ 6 1 , ▁the ▁first ▁practical ▁hel ic opter . ▁ 1 9 4 0 ▁– ▁World ▁War ▁II : ▁Under ▁the ▁Mol ot ov – R ib b ent rop ▁P act , ▁the ▁Soviet ▁Union ▁presents ▁an ▁ult imat um ▁to ▁Roman ia ▁requiring ▁it ▁to ▁c ede ▁B ess arab ia ▁and ▁the ▁northern ▁part ▁of ▁B uk ov ina . ▁ 1 9 4 1 ▁– ▁World ▁War ▁II : ▁Soviet ▁plan es ▁bomb ▁K assa , ▁Hung ary ▁( now ▁Ko š ice , ▁Slov ak ia ), ▁giving ▁Hung ary ▁the ▁imp et us ▁to ▁declare ▁war ▁the ▁next ▁day . ▁ 1 9 4 2 ▁– ▁The ▁first ▁flight ▁of ▁the ▁Gr um man ▁F 6 F ▁Hell cat . ▁ 1 9 4 4 ▁– ▁World ▁War ▁II : ▁San ▁Mar ino , ▁a ▁neutral