8 ▁– ▁Spanish – American ▁War : ▁American ▁troops ▁enter ▁the ▁city ▁of ▁May ag ü ez , ▁Puerto ▁Rico . ▁ 1 9 1 8 ▁– ▁World ▁War ▁I : ▁The ▁Battle ▁of ▁Am iens ▁ends . ▁ 1 9 2 0 ▁– ▁The ▁Lat v ian – S ov iet ▁Peace ▁Tre aty , ▁which ▁rel in qu ished ▁Russia ' s ▁authority ▁and ▁pret enses ▁to ▁Lat via , ▁is ▁signed , ▁ending ▁the ▁Lat v ian ▁War ▁of ▁Independ ence . ▁ 1 9 2 9 ▁– ▁B abe ▁Ruth ▁becomes ▁the ▁first ▁baseball ▁player ▁to ▁hit ▁ 5 0 0 ▁home ▁runs ▁in ▁his ▁career ▁with ▁a ▁home ▁run ▁at ▁League ▁Park ▁in ▁Cleveland , ▁Ohio . ▁ 1 9 3 4 ▁– ▁The ▁first ▁civil ian ▁prisoners ▁arrive ▁at ▁the ▁Federal ▁prison ▁on ▁Al cat raz ▁Island . ▁ 1 9 4 2 ▁– ▁Act ress ▁H edy ▁Lam arr ▁and ▁composer ▁George ▁An the il ▁receive ▁a ▁pat ent ▁for ▁a ▁Fre quency - ho pping ▁spread ▁spectrum ▁communication ▁system ▁that ▁later ▁became ▁the ▁basis ▁for ▁modern ▁techn ologies ▁in ▁wireless ▁tele ph ones ▁and ▁Wi - Fi . ▁ 1 9 4 5 ▁– ▁Pol es ▁in ▁Krak ów ▁eng age ▁in ▁a ▁pog rom ▁against ▁Jews ▁in ▁the ▁city , ▁killing ▁one ▁and ▁w ounding ▁five . ▁ 1 9 5 2 ▁– ▁Hus sein ▁bin ▁Tal al ▁is ▁proc laimed ▁King ▁of ▁Jordan . ▁ 1 9 5 9 ▁– ▁Sh erem ety