How is it that crop yields increased in the decades after world war ii despite the number of farms decreasing?

Crop yields in the United States increased in the decades after World War II despite the fact that the number of farms decreased. This was due mainly to the introduction of new technology that allowed the remaining farms and farmers to be much more productive.

These advances in technology were born out of an interest in research. Agricultural research increased during the 1940s, and this led to a revolution in agricultural technology. The technology allowed farmers to produce equal yields with less people involved.

what is the "this" there is no picture

explanation: we can only guess at how our actions may be perceived in the future. doing something really big like killing lots of people, saving lots of people, affecting the lives of lots of people is a sure fire way of being remembered in historical records. we can also make a difference in the history records by being a small influence on something bigger, whether that is as a civil servant, scientist or artist.

of course you could argue that we all affect history just as tiny cogs in a   bigger machine.

if you mean how do people influence our opinions of things which have already happened, then simply by writing a book which looks at things form a different perspective and trying to convince people that this perspective is more accurate or truthful. people do it all the time i.e. richard the third was a terrible or was he? plenty would disagree, it's just that their views aren't the most widely known.n: