▁successful ▁military ▁use ▁of ▁aircraft . ▁ 1 8 3 0 ▁– ▁William ▁IV ▁becomes ▁king ▁of ▁Britain ▁and ▁Han over . ▁ 1 8 4 3 ▁– ▁Tre aty ▁of ▁N ank ing ▁comes ▁into ▁effect , ▁Hong ▁Kong ▁Island ▁is ▁c eded ▁to ▁the ▁British ▁" in ▁perpet u ity ". ▁ 1 8 4 8 ▁– ▁End ▁of ▁the ▁June ▁Days ▁U pr ising ▁in ▁Paris . ▁ 1 8 5 7 ▁– ▁The ▁first ▁invest iture ▁of ▁the ▁Victoria ▁Cross ▁in ▁Hy de ▁Park , ▁London . ▁ 1 8 7 0 ▁– ▁The ▁Christian ▁hol iday ▁of ▁Christmas ▁is ▁declared ▁a ▁federal ▁hol iday ▁in ▁the ▁United ▁States . ▁ 1 8 8 6 ▁– ▁Henri ▁Mo iss an ▁isolated ▁element al ▁Fl u or ine ▁for ▁the ▁first ▁time . ▁ 1 8 8 9 ▁– ▁Bang ui ▁is ▁founded ▁by ▁Albert ▁Dol isie ▁and ▁Alfred ▁U z ac ▁in ▁what ▁was ▁then ▁the ▁upper ▁reaches ▁of ▁the ▁French ▁Congo . ▁ 1 9 0 6 ▁– ▁The ▁first ▁Grand ▁Prix ▁motor ▁racing ▁event ▁held . ▁ 1 9 0 9 ▁– ▁The ▁Science ▁Museum ▁in ▁London ▁comes ▁into ▁existence ▁as ▁an ▁independent ▁entity . ▁ 1 9 1 7 ▁– ▁World ▁War ▁I : ▁The ▁American ▁Ex ped ition ary ▁Forces ▁begin ▁to ▁arrive ▁in ▁France . ▁They ▁will ▁first ▁enter ▁combat ▁four ▁months ▁later . ▁ 1 9 1 8 ▁– ▁World ▁War ▁I : ▁Al lied ▁forces ▁under ▁John ▁J . ▁Pers hing ▁and