Vaccinations have had the greatest impact on preventing epidemics in the twenty first century. By providing immunity to populations against Infectious Diseases, vaccinations have significantly reduced the spread of diseases such as measles, polio, and influenza, ultimately preventing epidemics from occurring. Additionally, public health measures such as surveillance, rapid response protocols, and increased healthcare infrastructure have also played a key role in preventing epidemics.
Inventions involving steam power were among those that had the greatest impact during the last half of the 19th century.
Inventions involving steam power were among those that had the greatest impact during the last half of the 19th century.
Urban Living
computer
Cotton gin
The expansion of transportation networks, particularly the development of streetcars and railways, had the greatest impact on urban sprawl at the end of the nineteenth century. These systems made it easier for people to commute longer distances to work and live farther away from city centers.
barbed wire
steam engine and spinning jenny
The factor that had the greatest impact on union growth at the end of the 19th century was the popularity of social Darwinism.
the refrigerated box car
the discovery of electricity and all its myriad uses was arguably called the greatest discovery of the past century
the refrigerated box car