The FTSE 100 is falling! Here’s why I’d invest in a Stocks and Shares ISA today “This Stock Could Be Like Buying Amazon in 1997” Image source: Getty Images Click here to claim your copy now — and we’ll tell you the name of this Top US Share… free of charge! I’m sure you’ll agree that’s quite the statement from Motley Fool Co-Founder Tom Gardner.But since our US analyst team first recommended shares in this unique tech stock back in 2016, the value has soared.What’s more, we firmly believe there’s still plenty of upside in its future. In fact, even throughout the current coronavirus crisis, its performance has been beating Wall St expectations.And right now, we’re giving you a chance to discover exactly what has got our analysts all fired up about this niche industry phenomenon, in our FREE special report, A Top US Share From The Motley Fool. See all posts by Peter Stephens Investing in FTSE 100 shares through a Stocks and Shares ISA may not seem to be a sound move at the present time. After all, the index has fallen around 1,000 points from its record high and could move lower as the risks from the spread of coronavirus intensify.However, the index continues to offer long-term growth potential. Furthermore, many of its members now offer wide margins of safety. Therefore, now could be the right time to invest in a diverse range of large-cap shares through a Stocks and Shares ISA.5G is here – and shares of this ‘sleeping giant’ could be a great way for you to potentially profit!According to one leading industry firm, the 5G boom could create a global industry worth US$12.3 TRILLION out of thin air…And if you click here we’ll show you something that could be key to unlocking 5G’s full potential…Long-term growth potentialFocusing on the long-term growth prospects for the FTSE 100 can be a challenging process while it is delivering continued falls. Investors may naturally look at the risk of loss, rather than focus on the potential to make gains from FTSE 100 shares.However, at the present time, the index has a dividend yield of 4.8%. The only time it has been higher over the past 20 years was during the global financial crisis in 2008/09 when the outlook for many companies was far worse than it is today.As such, the index appears to offer good value for money at the present time. This does not mean that it will suddenly deliver a successful turnaround and surge to new record highs. But it does mean that investors who have a long-term time horizon may be able to access undervalued stocks to generate strong returns in the coming years.Historical performanceAlthough the past performance of the index is never perfectly replicated in the future, the track record of the FTSE 100 shows that it has always recovered from its challenges to post new highs.For example, since inception it has faced crises such as the 1987 crash, the technology bubble bursting and the global financial crisis. It has also experienced the challenges associated with the SARS outbreak. It has successfully recovered from all of those difficulties and, while some of them have lasted for many months and caused significant paper losses, in the long run, investors have benefited from purchasing undervalued stocks.Stocks and Shares ISAWith the returns from stocks held within a Stocks and Shares ISA being tax-free, it offers a simple and cost-effective means of capitalising on the FTSE 100’s long-term growth potential at the present time. And, with up to £20,000 allowed to be invested through an ISA each year, now could be a good time to use up this year’s allowance while the FTSE 100 appears to offer good value for money.Buying stocks during a downturn is never an easy step to take. But over the long run, history shows that it can be an effective means of improving your portfolio’s risk/reward ratio and generating impressive total returns as the market recovers. Simply click below to discover how you can take advantage of this. Peter Stephens has no position in any of the shares mentioned. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors. Peter Stephens | Saturday, 29th February, 2020 | More on: ^FTSE Renowned stock-picker Mark Rogers and his analyst team at The Motley Fool UK have named 6 shares that they believe UK investors should consider buying NOW.So if you’re looking for more stock ideas to try and best position your portfolio today, then it might be a good day for you. Because we’re offering a full 33% off your first year of membership to our flagship share-tipping service, backed by our ‘no quibbles’ 30-day subscription fee refund guarantee. 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