Answer:
In 1819, the United States and Spain signed the Adams-Onís Treaty. With this treaty, Spain gave up its lands in the Oregon Country. Spain's territory would end at California's northern border. In 1824, Russia gave up its claims on lands south of Alaska.
Explanation:
There was 178 colonies found in the 1620s
The important development that allowed Dontrell to attend the birth of his child is the<u> </u><u>invention </u><u>of the</u><u> airplane/ air travel. </u>
Air travel:
- Has allowed humans to transverse great distances within very short periods
- Has revolutionized logistics in human society
Thanks to air travel being invented, humans can move distances that would take days by other modes of transport in mere hours. This will allow Dontrell to come back in time to attend the birth of his child.
In conclusion, Dontrell will not miss the birth of his child thanks to the invention of air travel.
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