It depends on what you mean by positive, Immigration is a dangerous, risky journeys that tend to have harsh effects so it's not really a "happy" thing.
Now if you mean positive as in good for our country, then it is. Sometimes though an immigrant will commit crimes while he/she is here, then it negative. Sadly our very broken country sees it as a negative thing overall.
Cultural diversity
Immigration itself is positive, and nothing but positive. Every single person in the US has immigrant background at some point, if you consider that when the US was established, there was no person for whom it was not a new nation. That's the positive. The negative is that illegal immigration is a violation of federal law. If I violated the law, I would expect to be held accountable.
The only disease that limits immigration is TB tuberculosis.
Some negatives are that they affect the economy and the job market.
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The Positives of Immigration Say you lived in a war torn country if you immigrated to North America form that war torn place, it would be a positive move.
Most of the population growth in Europe can be credited to immigration.
A increase in birth rates and increase in immigration or the death rate decreases.
to stop Immigration
Immigration
decreased Immigration
Immigration from Canada decreased, while immigration from Mexico increased.