Connecting at Schiphol

Yes that is enough time. The airline would not be able to sell it to you that way otherwise. If you missed the connection because the flight from O'hare left too late the airline will just put you on the next available flight. There are ten direct flights to Paris on Delta partner airlines Air France and KLM from Amsterdam. The longer layover is probably more expensive if this connection makes you nervous.

Schiphol is huge, but it's also a very efficient airport. If everything is on time, 1:15 should be just enough time. You may still have to walk quite a ways (everything is all in one big terminal as I recall) to your gate for the Paris flight; you'll go through immigration first, then perhaps through security again (don't recall) then have to walk to your next gate.

I would assume there is another Delta or KLM/Air France flight (Delta partner) flight on to Paris if you arrive late from Chicago, so you'd just get put on the next flight out to Paris. At worst you'd be delayed a few hours. This assumes your flights are both on the same Delta ticket. In that case, no real worries at all.

Another option is to take the high-speed Thalys train from Schipol to Paris. The advantage being that the train takes you direct to the city center. KLM sells airfare packages that includes the train fare:
https://tinyurl.com/ycbc9yrp

I agree with Andrew's take on Schiphol. They are so efficient. Although we fly Delta through Schiphol our usual layover is about 3 hours. We've been fortunate over the years to have plenty of time. If this was CDG, I would not recommend 1 hour & 15 minutes! We barely made it to our connecting flight with 3+ hour layover.

Michael's idea to take the train isn't awful; the problem is, if your flight into Schiphol is late, you'll miss the train you've booked ahead of time (to get a good fare) - or you'll have to buy your train tickets at the last minute, upon arrival, at the last-minute price$$$s. it does take an hour to get into Paris from CDG, though, whereas you can get a train directly at Schiphol into central Paris - 3 hours vs. the 1 hour trip from CDG. I do prefer a plane to train connection if possible vs. plane to plane - on a train I can get up, walk around, use my phone, etc. Sometimes you can buy plane + train on the same ticket and be "protected" in case of a delay.

We are looking for flights from Chicago to Paris. We have found one on
Delta that connects in Amsterdam but we only have 1 hour and 15
minutes between flights. Is this enough time for this connection? Both
flights are Delta so we don’t have to change terminals or anything.
Would appreciate any advice...thanks.

As an FYI, both flights are not on Delta. They are on KLM which is a Delta partner.

75 minutes is too tight and I would not do it simply because your inbound flight could be late and if you miss it, you will have to wait for a KLM flight to Paris that has available seats.

If you choose to roll the dice, do not check your bags because even if you make your connection to Paris, your checked bag may not if your inbound flight from ORD is late. Make sure you are seated as close to the front of the transatlantic flight as possible as you could lose 15 minutes deboarding if you're seated in the back. KLM might also close your connecting flight 10-15 minutes before departure time so a late arrival from O'Hare would be that much worse.

If you choose to roll the dice, do not check your bags because even if you make your connection to Paris, your checked bag may not if your inbound flight from ORD is late.

Yes, from my experience (I use to process these claims at O'hare for an airline) tight connections are one of the roots of loss baggage claims.

When are you flying? If it is a time period where weather delays in Chicago are frequent, don't do it. I'd also suggest researching KLM flights that leave later to identify your options if you miss the connection. And definitely carry on bags only. AMS is usually an easy connection, but you have no wiggle room with that layover time.

We also have a 1 hour and 15 min layover.
When we connected at Schiphol last June, there were very long lines to connect to other European flights. They were pulling people from the line who had close connections and giving them priority. Does anyone know if this long wait has been corrected?

At immigration for connecting passengers there is typically an express lane open for passengers with flights very departing soon. There is a monitor above the lane showing which flights qualify.

Airlines routinely offer connections that are very tight. Twice on international flights I made connections by running from one gate to the next. I caught the flight; my suitcase didn't. Far less stressful to choose a later flight south. Amsterdam airport is hospitable, so get some euros from a bank machine, shop (but don't buy) in the flower bulb shops, listen to amateurs at the public piano, and eat a decent lunch, all without worrying. PS: So-called 'duty free' booze is not much cheaper for interior Europe flights these days.