Assuming you're pro-Columbus day, these are points that can be made:
Being historically accurate, Columbus day should be celebrated because he attempted and was successful at colonizing and helping America grow.
A common argument trying to counter being pro-Columbus day is the mention of killing Native Americans, so you can mention that diseases had already existed and were the primary cause of death in the New Land rather than Natives being killed (keep in mind though that disease and murder were both factors).
Another Pro argument that could be made is the fact that yes, vikings DID find America first, however Columbus helped Americas economy, etc.
Assuming you're anti-Columbus day, these are more points:
What Christopher Columbus did to Native Americans is unjust, essentially he took land from the Natives and they were forced to convert and change their lifestyle in order to work with Columbus or were killed; brutality is unacceptable.
The day itself should be focused on the Native American victims of Columbus.
The vikings technically found the New Land.
I hope this helped a little! :)
The answer is 1501 AD - 1600 AD
The harm globalization is causing outweighs the benefits to individuals and the world economy.
Globalization is the process by which the world slowly has becoming more and more connected through trade, exchange of people and ideas. This process is made possible by quick trasportation, the internet and free trade laws between states. The immediate effect is quite positive, as trade propels growth and wealth often follows grown. However, we should also be aware of the weight of our actions on the environment. Globalization in se it's not nor bad or good, it's more how we carry on the process that matters. As for now, the harm the globalization is causing is the environment outweight any possible benefit, simply because we have avuse our environment so much it simply cannot take more. We are well over the promise to keep the temperature below 2°, and this is not a sustainable pathway.