photography and the world (speech)?

[Harry Potter]

Your approach is spot on and it is already interesting...

Your first point is called 'illustration'...photography helps attract attention, it can be used to illustrate important and controversial topics...it might encourage people to protest against or support different issues.

The second point is within the 'economy'...it's a massive industry...in manufacturing cameras, photographic equipment and materials...camera shops supplying everything that both professional and enthusiasts need...professional photography is essential in marketing and advertising products...anything and everything can be promoted with a simple image.

The third point...Photography records and documents important events (history)...it reminds us of the times that were worth celebrating...with our friends, families and country...and can also help us remember the tragedies of the past helping influence how we live today.

Add your own specifics and you will have a pretty good presentation...well done and good luck..!