Yes, this is true!
You should genereally use sources for anything you say if it's not your original idea - this way you can avoid being accused of plagiarism.
One exception is common knowledge - so you don't have to provide sources for example for what a capital of a certain country is.
It would be the Hacienda system. I’m not sure if your talking about Spanish slavery but if you are it’s the Hacienda system because it functioned by keeping the people working on the land in debt in some way or another so that they could not leave.
Exposition: Explains things before the story began and often provides background info on characters!
Rising Action: Plot begins to complicate and twist and Reveals point of view
Falling Action: Occurs after the climax and conflicts begins to be worked out and tensions lesson
Answer:
Expo 2020 is a world expo to be hosted by Dubai in UAE, originally scheduled for 20 October 2020 to 10 April 2021. Due to pandemic it has been shifted to 1st October 2021 to March 2022. Though it is in 2021, the name 2020 is retained for marketing purposes.
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