With the acquisition of smaller companies by larger ones, the 1960's saw a wave of new conglomerates.
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Thefearofsmallpox,whichterrorizedtheeighteenthcentury,hasnoanalogy(likeness)today.
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.
In1861itseemedinevitablethattheSouthernstateswouldbreakawayfromtheUnion.