I didn't look this up or anything but I'm pretty sure that the early Americans economics problem was who was in charge. I know this for fact because it still goes on today because we have to vote for presidents as the ruler of the countries.
You're Welcome in advanced! I hope this helped!
This is of course a very complex question that does not have a definitive answer, but 1850s would be a good decade to start counting as "Modern". This was a decade of the telegraph and Darwin's The Origin of Species.
<span />
<span>The answer is "Physical" </span>development.
The term lifespan development<span> alludes
to age-related variations that happen from birth, all through an individual's
life, into and amid old age. The six phases of lifespan development<span> are: Infancy,
Childhood, Adolescence, Early Adulthood, Middle Age, Older Age. Infancy.</span></span>
Fun fact: Life span<span> is the most extreme time a man can live, though life
expectancy<span> is the
normal time a man will live, in view of elements like sexual orientation and
birth year. </span></span>
<span>France Allied with American Colonies</span>
<span>It was a general in the Continental Army during the War of Independence <span>of the United States. (</span></span><span>it is known for betraying the United States<span>)</span></span>