Accumulating Treasury Bond ETF questions

Hi, I have few questions on this particular type of ETF:

1. Comparing IB01 (0-1yr) and CSBGU0 (7-10yr), the former only goes up, while the latter drops to 5-year-low. Is this because 0-1yr has shorter maturity so it can react to rate change and roll its fund accordingly, and 7-10yr is similar to the current bank liquidity crisis, and it's forced to take a loss when ETF holders exits?
2. IB01 chart looks like a reverse waterfall: 2019 to 2020 had about 2-3% growth, 2020-2022 basically flat-lined, and 2023 is doing about +0.5% per month. Is it safe to say IB01 is strongly correlated to fed rates?
3. When Fed is cutting rates, as long as it's not violently sudden (e.g. 5% to 0% in 2 quarters), is it safe to assume IB01 will continue to grow or flat-line, instead of taking a loss like its 7-10yr counterpart?
4. Lastly, is it possible to get similar ETF in US markets? I seems all these treasury bond ETFs are all listed outside US.

Thanks!